
Incidents of the war, group at Secret Service Department Headquarters, Army of the Potomac, Antietam, October 1862.
50th year anniversary print (1912) from original print.
Summary: Photograph shows fourteen men, including Allan and William Pinkerton, and several Union Army officers posed in front of a tent.
Library of Congress image.

Sharpsburg, Md. View with Episcopal church in distance; photograph by Alexander Gardner.
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Antietam, Md. Allan Pinkerton (“E. J. Allen”) of the Secret Service on horseback; photograph by Alexander Gardner.
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Photographic print on stereo card: albumen, hand colored; 8 x 17 cm, showing a stone house on the eastern side of Antietam Bridge; photograph by Alexander Gardner.
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Keedysville, Md., vicinity. Smith’s barn, used as a hospital after the battle of Antietam.
Photographed by Alexander Gardner.
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Antietam, Md. Blacksmith shoeing horses at headquarters, Army of the Potomac.
Photographed by Alexander Gardner.
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Photograph showing Captain J. M. Knapp’s Pennsylvania Independent Battery “E” Light Artillery approaching the battlefield at Antietam, Maryland after the battle in September 1862. A dead horse lay in the foreground.
Photo by Alexander Gardner.
Given the long exposure times required for early photography, this image was staged at some time after the battle.
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Antietam, Md. Seated: R. William Moore and Allan Pinkerton. Standing: George H. Bangs, John C. Babcock, and Augustus K. Littlefield; photographed by Alexander Gardner.
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Antietam, Md. Col. John S. Crocker, Lt. Col. Benjamin C. Butler, and adjutant of 93d New York Volunteers (Waters Whipple Braman; see comment by , below) photographed by Alexander Gardner.
Library of Congress image.